Sorry, one steap ahead of you again. :-) That breaks down when you need to add a nameless widget to another also nameless widget:
for (HBox->new) { $_->config1($param1); $_->config2($param2); my $sb = Scrollbar->new; for ($sb) { $_->config1($param3); $_->config2($param4); } $_->add($sb); $window->add($_); }

You need a temporary variable, although at least this one can be tightly scoped.

It also mingles method calls against several different widgets into a single block, which makes it harder to see what gets added where when. Your proposal is ok on a smaller scale, but scales badly - if you nest several unnamed widgets, it gets messy quick.

If you look at the tutorial at you'll see a really ugly style with lots of variable reuse and calls to different widgets interwoven in a single block. It made my head swim trying to read even the shorter example programs. configure_object was the result of several iterations of refactoring for readability.

It took enough effort and was beneficial enough that I felt I had to share this.

Update: Actually I suppose one can coerce the for approach into clean separation by adding some do to the mix:

$window->add(do { my $hbox = HBox->new; for ($hbox) { $_->config1($param1); $_->config2($param2); $_->add(do { my $sb = Scrollbar->new; for ($sb) { $_->config1($param3); $_->config2($param4); } $sb; }); $hbox; });
but that's quickly slipping into the realm of cumbersome. I really spent some serious time trying to get this whole deal to look reasonably readable, and no conventional tools would help, hence the snippet.

Makeshifts last the longest.

In reply to Re^4: multiple method calls against the same object (f.ex GUI programming) by Aristotle
in thread multiple method calls against the same object (f.ex GUI programming) by Aristotle

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